Async programming in C#

Question

I'm trying to get my head around asynchronous programming in C#. I've created a basic WPF program. This includes a new class CleaningService that has an async Start() method. The WPF program has a button that calls the Start() method on click.

Within this Start() method, I want to call an async Method1() method and then an async Method2() method.

When I click on the button, Method2() doesn't get called. Why would this be the case?

Code:

class CleaningService : ICleaningService
{
    private bool _continue;

    public async void Start()
    {
        this._continue = true;

        if (!await this.Method1())
        {
            this._continue = false;
        }

        if (!await this.Method2())
        {
            this._continue = false;
        }
    }

    public void Cancel()
    {
        this._continue = false;
    }

    public async Task<bool> Method1()
    {
        // do something
        Console.WriteLine("Processing Method1..");
        return await new Task<bool>(() => true);
    }

    public async Task<bool> Method2()
    {
        if (this._continue)
        {
            // do something
            Console.WriteLine("Processing Method2..");
            return await new Task<bool>(() => true);
        }
        else
        {
            return await new Task<bool>(() => false);
        }
    }
}

You should never use the task constructor. Ever.

Stephen Cleary
– Stephen Cleary

2016-12-19 02:22:38 +00:00
Commented Dec 19, 2016 at 2:22 — Stephen Cleary
– Stephen Cleary, Commented Dec 19, 2016 at 2:22

Andrés Robinet · Accepted Answer · 2016-12-10 16:55:28Z

3

You never started the task in Method1 (you just created a Task, but it was never started)

answered Dec 10, 2016 at 16:55

Andrés Robinet

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2 Comments

kong88 Over a year ago

Ah thanks. I guess I should just do something like Thread.Sleep(1); instead.

Andrés Robinet Over a year ago

You can do use Task.Run(...)

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